Portable printer



FIG. 1 is a front and right perspective view of a portable printer showing my design;

FIG. 2 is a rear and left perspective view thereof;

FIG. 3 is a right side elevational view thereof; and

FIG. 4 is a front elevational view therof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a portable printer, as shown and described. 